hwmon: (ina2xx) Set alert latch

Alerts should only be cleared after reported, not immediately after the
alert condition has been cleared. Set the latch enable bit to keep alerts
latched until the alert register has been read from the chip.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/ina2xx.c

@@ -67,6 +67,7 @@
 
 #define INA226_READ_AVG(reg)		FIELD_GET(INA226_AVG_RD_MASK, reg)
 
+#define INA226_ALERT_LATCH_ENABLE	BIT(0)
 #define INA226_ALERT_POLARITY		BIT(1)
 
 /* bit number of alert functions in Mask/Enable Register */
@@ -640,7 +641,9 @@ static int ina2xx_init(struct device *dev, struct ina2xx_data *data)
 	if (data->chip == ina226) {
 		bool active_high = device_property_read_bool(dev, "ti,alert-polarity-active-high");
 
-		regmap_update_bits(regmap, INA226_MASK_ENABLE, INA226_ALERT_POLARITY,
+		regmap_update_bits(regmap, INA226_MASK_ENABLE,
+				   INA226_ALERT_LATCH_ENABLE | INA226_ALERT_POLARITY,
+				   INA226_ALERT_LATCH_ENABLE |
 						FIELD_PREP(INA226_ALERT_POLARITY, active_high));
 	}